Centrifugal screen.



vITENTED APR. 5, ,1904. C. E. DULIN.

GENTRIFUGAL SCREEN.

APPLICATION FILED JUNE 19, 1903. H0 IODEL.

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l I l l l l I PATENTE!) APR. 5, 1904.

C. E. DULIN. CENTRIEUGAL SCREEN.

APPLICATION FILED JUNI: 19. 190s.

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UNirED STATES Patented April 5, 1904.,

PATENT OFFICE..l

`CHARLES E. DULIN, OE GLEN S FALLS, NEW YORK, ASSIGNOR TO THE UNION BAG& PAPER COMPANY, OF SANDY HILL, NEW YORK, A

CORPORATION.

CENTRIFUGAL SCREEN.

SPECIFICATION forming part of Letters Patent N0. 756,342, dated April 5,1904.

Application filed Tune 19,I 1903. Serial No. 162,156. (No model.)

To all whom it may concern.-

Be it known that I, CHARLES EDWIN DULIN, a citizen of the United States,residing at Glens Falls, county of I/Varren, and State of New York, haveinvented certain new and useful Improvements in Centrifugal Screens, ofwhich the following is a specification.

The invention relates to such improvements; and it consists of the novelconstruction and combination of parts hereinafter described andsubsequently claimed.

Reference may be had to the accompanying drawings, and the referencecharacters marked thereon, which form a part of this specification.

Similar characters refer to similar parts in the several figures.

Figure 1 of the drawings is an end view'n in elevation and partly insection along the broken line 1 1 in Fig. 2 of my improvedcentrifugalscreen with a portion of the end wall of the case broken away to show aportion of the interior mechanism. Eig. 2 is a central vertical sectionof the upper portion of the same, the lower half being shown in sideelevation. Eig. 3 is a plan View of the slotted supply-tube detached andremoved from the case with a portion of the end wall broken away to showthe interior construction. Fig. A is a vertical cross-section taken onthe broken line i 4l in Fig. 3. Fig. 5 is a plan View of thewater-supply tube detached and removed from the cas'e.

My invention is well adapted for screening wood-pulp to remove therefromsticks, slivers of wood, and other foreign substances.

The principal objects of my invention are to facilitate the removal ofthe screenings from the perforated cylindrical screen while the same isin use, to provide a convenient means for regulating the supply ofmaterial to be screened to the screen, and to provide a convenient meansfor diluting with water the material to be screened.

The invention consists ofa cylindrical screen or drum having perforatewalls and means for rotating the same about a horizontal axis coincidentwith the axis of the drum, a trough exteriorly supported and projectedthrough one end of the drum interiorly and provided with teeth forremoving the screenings from the inner surface of the drum, andmeans forforcing the screenings along the trough and out of the drum, asupply-tube exteriorly supported and projected into the drum andprovidedwith ports which allow the material to be screened to beprojected against the perforate wall of the drum in a radial direction,and a watersupply tube projected interiorly of the drum on one side ofthe material-supply tube and provided with ports for forcing the waterradially against the perforate side of the drum, as hereinafter morefully described, and set forthin the claims.

The stationary cylindrical case 1 is provided on each of its ends withbearingsupports 2, supporting the bearings 3, containing a r0- taryshaft 4, on whichv are mounted the driving-pulley 5 and loose pulley 6,also a kconcaved disk 7, adapted to close one end of the cylindricalshell or drum 8, containing the slot-perforations 9. The perforate shellis held in position against the periphery of the disk by means of aseries of transverse bars 10, each provided with'an angle offset 12,secured at one end to the peripheral. part ofthe disk 7 by means of aseries of rivets 13. The other end of each bar is held in position bymeans of the annular ring plate 15, having a rib 16 engaging with theinner surface of the edge of the screen and a ring 17 inclosing the endsof the bars. The inner edge of the ring plate constitutes a flange whichpartially closes the otherwise open end of the the inner surface of theperforated shell and remove therefrom screenings which may adherethereto. The perforate shell is adapted to travel in a directionindicated by the arrow 27 in Fig. 1 past the teeth 25', so that when thescreenings are removed from the perforate shell by the teeth they willfall beneath the teeth through the opening 28 into the trough 24. Eachend of the tubular trough screw-thread will force the screeningsdeposited in the trough voutwardly until they are projected through theopening 36 exteriorly of the case. The operation of conveying thescreenings along the trough may be facilitated by means of waterinjected at the inner end of the trough, as through the supply-pipe 40,leading from a source of supply (not shown) into the trough itself. Insome cases a jet of water so forced into the trough will be suflicientto convey the screenings along the trough and out of the case withoutthe aid of the screw.

This improved screen is especially adapted for use in screeningwood-pulp, the chips and slivers of wood being retained on the innersurface of the screen and removed therefrom by the teeth into thetrough, and thus carried out of the case, as above described, while thescreened pulp passes through the apertures in the shell and into thecase 1, which incloses` the shell, falling by gravity to the lower sideand passing out of the take-offs 44 to a suitable receptacle. (Notshown.)

By providing the end wall of the case with a lateral opening 50 theteeth 25 may be riveted onto the tubular trough 24 before the trough isinserted within the drum, the teeth being passed through the opening 50and the trough afterward rotated to bring the teeth in the properposition, as shown in Fig. 1. When so inserted, the supporting-sleeve 20is not secured to the case-wall until after the insertion of the trough.After the trough is inserted and before the pulley 32 is secured to theshaft 31 the sleeve20 is slipped onto the outer end of the trough andbolted to the case,

as shown. The trough is held in the proper position in the sleeve bymeans of screws 51.

is the supply-tube, closed at its inner end by means of the head 61,(shown in Fig. 3,) and is provided on its louter end with anattaching-ange 62,which is secured to the outer casewall by means ofscrew-bolts 63. rlhe outer end may also be screw-threaded, as shown at64 in Fig. 3, for the purpose of attaching other lengths of pipethereto. The inner end of the supply-tube is also provided with a sleeve65,

rotatable upon the tube. The tube is provided with a longitudinal slot66 and the sleeve with a similar slot 67. By rotating .the sleeve uponthe tube the two slots can be made to exactly register or adjustedrelatively to each other,

so as to vary the capacity of the slots for discharging the material tobe screened from the tube. The sleeve can be held in the proper adjustedposition upon the tube by means of the thumb-screw 68 passing throughslot 69 in the sleeve and inserted in the screw-threaded aperture in thetube. The tube is so located interiorly of the drum that the materialwill be discharged through the slots 66 and 67 radially to the drumagainst the perforate wall of the drum. The centrifugal force exerted bythe rapidly-rotating drum forces the material to be screened through theperforations, except the sticks, slivers, and other foreign substances,which are deposited on the inner face of the drum. The material ispreferably supplied in such quantities that most of the liquid materialwill pass through the perforations before any given part of theperforated shell has made acomplete revolution. By locating thesupply-tube just in the rear of the screenings-trough, as shown in Fig.1, the pulp will mostly pass through the perforations of the drum beforereaching the screenings-trough, leaving nothing but the foreign matteron the perforate shell, which is removed by the scraper-teeth anddeposited inrthe open trough. A hand-hole in the casewall, indicated bydotted lines 7 O and covered by plate 71, oscillatory on pivot 72,permits of access to the thumb-screw 68 to adjust the sleeve on the tubeand regulate the flow olf the material to be screened through the s ots.

The water-supply tube 75, having a longitudinal slot similar to that intube 60, is inserted just in the rear of the material-supply tube, asshown in Fig. l, and secured therein by screw-bolts 76. By means of thistube the material to be screened can be diluted as desired. Byprojecting a radial sheet of water from this tube against the perforatedwall of the drum the material to be screened already deposited thereinby the supply-tube 60 is still further agitated and its -passage throughthe perforations in the drum or screen facilitated. The supply of waterin thistube 75 can be regulated by a stop-cock in the supplytubeconnected therewith. (Not shown.) The inner end of the water-supply tubeis closed by means of a screw-threaded plug 79, screwed into the end ofthe tube. j

`What I claim as new, and desire to lsecure by Letters Patent, .is-

1. In a centrifugal screen, the combination with a side perforated drumrotatable upon a horizontal axis; and means for supporting and rotatingthe same; of means for projecting the material to bescreened against oneside of the drum and upon its inner surface;

IOO

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a stationary stripper within the drum just in advance of the projectedmaterial for` removing the screenings from the perforated wall of thedrum; a horizontally-disposed trough beneath the stripper extendingwithout the drum; means for conveying the screenings along the troughwithout the drum; anda receiver for the screened material, substantiallyas described.

2. In a centrifugal screen, the combination with a side perforated drumrotatable upon a horizontal axis; and means for supporting and rotatingthe same; of means for projecting the material to be screened againstone side of the drum and upon its inner surface; a stationary troughexteriorly supported in a horizontal position and projecting into thedrum just beneath its upper side; means for stripping the screeningsfrom the inner surface of the drum just above the trough whereby theydrop into the trough; and means for injecting water into the inner endof the trough t@ carry the screenings along the trough out of the drum;and a receiver for the screened material, substantially as described.

3. In a centrifugal screen, the combination with a side perforatedrotatable drum; and means projecting interiorly of the drum forsupporting and rotating the same; of means for projecting under pressurethe material to be screened against one side of the drum and upon itsinner surface; means for projecting water against the inner surface ofthe drum on one side of the projected material to be screened wherebythe material can be diluted; and a receiver for the screened materialand water inclosing the drum, substantially as described.

4. In acentrifugal screen, the combination with a side perforated drumrotatable upon a horizontal axis; means projecting interiorly forsupportlng the drum and means for positively rotating the same; of astationary supply-tube projecting intothe drum with its axial linepractically parallel with the axis of the drum, and provided along thatside which faces away from the axis of the drum, with a supply port orports; and a drum-inclosing case extending entirely around the drum,substantially as described.

5. In a centrifugal screen, the combination with a side perforated shellrotatable upon a` horizontal axis open at one end; and means forsupporting and rotating the same; of an inwardly-projecting flange atits open end; exteriorly-supported stripping and conveying mechanismprojected through the open end into the shell whereby the strippingmechanism is adapted to act upon the inner surface of the screen; and asupply-tube exteriorly supported and projected through the open end intothe shell, substantially as described.

6. In a centrifugal screen, the combination with a side perforatedrotatable drum; and means for supporting and rotating the same; of asupply-tube projected into the drum and containing a slot or opening onone side; a sleeve rotatable on said tube and provided with a similarslot or opening adapted to register' with the opening in thesupply-tube; and means for securing the sleeve in an adjusted positionon saidl tube whereby the sizeof the side opening can be varied asdesired, substantially as described.

In testimony whereof I have hereunto set my hand this 12th day of June,1903.

' CHAS. E. DULIN.

Witnesses: L

W. R. BULLARD, H. E. WARREN.

